The UserAgent element SHOULD contain the information
in the User-Agent header. The User-Agent header SHOULD be removed from the HTTP
request. The server does not validate the value of the UserAgent
element.

Protocol Versions

The following table specifies the protocol versions that
support this element. The client indicates the protocol version being used by
setting either the MS-ASProtocolVersion header, as specified in [MS-ASHTTP]
section 2.2.1.1.2.6,
or the Protocol version field, as specified in [MS-ASHTTP] section 2.2.1.1.1.1,
in the request.